A portion of vascular tissue (PO:0009015) that has as part one or more tracheary elements (PO:0000290). [source: ISBN:0471245194]
Comment
Functions in the translocation of water and solutes from roots (PO:0009005) to the shoot system (PO:0009006) and in support. Tracheary elements have lignified cell walls with secondary thickening and are dead at maturity.